Hi there

I'm doing LHR-OSL-LYR. Now I know that the OSL-LYR bit goes from the domestic terminal where there is no lounge. The LHR-OSL arrives OSL late at night and the OSL-LYR departs in the morning of the next day.

My question is:
(a) is the international lounge at OSL open overnight?
(b) when you arrive at OSL from LHR, can you get to the lounge, or do you pass through security preventing you from returning to the lounge?

Thanks!